System.IO.Compression是.Net 2.0里與壓縮有關的命名空間,但是使用起來并不是很方便。使用第3方庫ziplib可以很方便地進行壓縮類的操作。

????? 從[1] 下載動態庫，然后在工程里Add Reference，把ICSharpCode.SharpZipLib.dll加進去。

在代碼來創建一個zip包的例子如下（摘自ziplib sample code）

using ICSharpCode.SharpZipLib.Checksums;

using ICSharpCode.SharpZipLib.Zip;

using ICSharpCode.SharpZipLib.GZip;

把指定目錄下的所有文件壓縮到一個zip包里

??????? private void ZipTheReports()
??????? {
??????????? string year = System.DateTime.Today.Year.ToString();
??????????? string month = System.DateTime.Today.Month.ToString();
??????????? string days = System.DateTime.Today.Day.ToString();????

??????????? string[] filenames = Directory.GetFiles(curDir);

??????????? string zipFileName = "Rplan Report " + year + month + days + ".zip";
??? ????????string zipAbsPath = this.curDir + zipFileName;

??????????? zipRelativePath = zipFileName;

??????????? Crc32 crc = new Crc32();
??????????? ZipOutputStream s = new ZipOutputStream(File.Create(zipAbsPath)); // 指定zip文件的絕對路徑，包括文件名

??????????? s.SetLevel(6); // 0 - store only to 9 - means best compression

??????????? foreach (string file in filenames)
??????????? {
??????????????? FileStream fs = File.OpenRead(file); // 文件的絕對路徑，包括文件名

byte[] buffer = new byte[fs.Length];
fs.Read(buffer, 0, buffer.Length);
ZipEntry entry = new ZipEntry(extractFileName(file)); //這里ZipEntry的參數必須是相對路徑名，表示文件在zip文檔里的相對路徑

entry.DateTime = DateTime.Now;

?

// set Size and the crc, because the information

??????????????? // about the size and crc should be stored in the header

??????????????? // if it is not set it is automatically written in the footer.

??????????????? // (in this case size == crc == -1 in the header)

??????????????? // Some ZIP programs have problems with zip files that don't store

??????????????? // the size and crc in the header.

??????????????? entry.Size = fs.Length;
??????????????? fs.Close();

??????????????? crc.Reset();

??? ????????????crc.Update(buffer);

??????????????? entry.Crc = crc.Value;

??????????????? s.PutNextEntry(entry);

?

s.Write(buffer, 0, buffer.Length);

??????????? }

??????????? s.Finish();
??????????? s.Close();

??????? }

?

// e.g. convert ?c:\\temp\test.xls to test.xls

?????? private string extractFileName(string filePath)
??????? {

??

??????????? int index1 = filePath.LastIndexOf("\\");

??????????? string fileName =

??????????????? filePath.Substring(index1+1);

?

return fileName;
}

?

Reference

1．ZipLib
http://www.icsharpcode.net/OpenSource/SharpZipLib/Default.aspx
A port of zlib library to C#. Its license allows developers to include this library in commercial, closed-source applications.

2. System.IO.Compression Namespace
http://msdn2.microsoft.com/en-us/library/system.io.compression.aspx

DeflateStream Class
http://msdn2.microsoft.com/en-us/library/system.io.compression.deflatestream.aspx

3．Compression Application Sample
http://msdn2.microsoft.com/en-us/library/ywf6dxhx.aspx

This sample demonstrates compression capabilities available in the .NET Framework. It builds a Windows Forms application that employs the GZipStream and DeflateStream types to compress and decompress files. The sample also introduces several types that are new in the .NET Framework version 2.0.

?

4. Using the Zip Classes in the J# Class Libraries to Compress Files and Data with C#

http://msdn.microsoft.com/msdnmag/issues/03/06/ZipCompression/default.aspx

轉載于:https://www.cnblogs.com/yuquanlaobo/archive/2007/01/17/622851.html

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